TRANSMISSION OF WELL-LOGGING DATA OVER BANDPASS CHANNELS USING QUADRATURE AMPLITUDE MODULATION - Patent 0571530

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EP 0 571 530 A1

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(43)	Date of publication:
	01.12.1993 Bulletin 1993/48

(21)	Application number: 92906824.0

(22)	Date of filing: 05.02.1992

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International Patent Classification (IPC):

H04L 27/ 20^{( . )}
H04L 27/ 36^{( . )}

H04L 27/ 34^{( . )}

(86)	International application number:
	PCT/US1992/000891

(87)	International publication number:
	WO 1992/015165 (03.09.1992 Gazette 1992/23)

(84)	Designated Contracting States:
	DE DK FR GB IT NL

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Priority:

15.02.1991 US 19910657225

(71)	Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
	Austin, Texas 78720-0015 (US)

(72)	Inventors:
	MONTGOMERY, Michael, A. Cedar Park, TX 78613 (US) NEELEY, Jimmy, E. Georgetown, TX 78628 (US) LYON, David, L. Rancho Santa Fe, CA 92067 (US) POONPOL, Chanchai San Diego, CA 92129 (US)

(74)	Representative: Hagel, Francis, et al
	ETUDES ET PRODUCTIONS SCHLUMBERGER Service Brevets B.P. 202 F-92142 Clamart Cédex F-92142 Clamart Cédex (FR)

(54)	TRANSMISSION OF WELL-LOGGING DATA OVER BANDPASS CHANNELS USING QUADRATURE AMPLITUDE MODULATION